So basically you want to hide it in plain sight? I'm presuming you know what a normal deed looks like, otherwise this won't make sense.
Here's how I'd go about it. You need a large parcel of land owned by multiple separate owners, preferably next to the office building. I'd set up a bunch of shell companies to acquire the various lots. You do this legitimately to avoid the appearance of one purchaser looking to acquire land, driving up the price, so it's not something anyone in his company would think about.
Let's say the company is putting in a mall, covering 300 acres including the parking lots. To acquire all the land required buying fifty different lots, for which you used ten different companies. Oh, yeah, you've got one deed for the office building.
Now you take all those deeds and transfer them to a new holding company, so that all the land has a common ownership. Normally you'd do this by writing one deed from each of the ten different companies. However, because you no longer have to worry about someone driving the price up, you decide to write one deed listing all of the lots, with all of the grantors on this one deed. Realize that this deed is going to be long, and complicated.
And oh, yeah, you add in the deed for the office building. But instead of making sure it's listed in a clear fashion, you forget to include a line break and run it into another description. Whoops. The secretary screwed up. And you haven't broken any laws.
You then take this entire mess and go in front of the zoning board, drop off the office building, and get approval from the zoning board to build your company's mall and combine your little lots into a big one. You set up a management company to manage the mall, responsible for paying the property taxes among other things.
The company is happy with its new mall, and makes lots of money from it.
Meanwhile, the office building has gotten lost in the shuffle. You set up a management company to manage it, and make sure that it is managed in such a fashion that it doesn't make any money. It files a separate tax return from the big company, but since it is washing on income and expenses, there's no tax liability, and maintains a nice low profile.
At any point after the office building is shed out of the big lot, you can explain it by a simple typo. Biggest stumbling block will be the financing portion, but if this mess is confusing enough, you can lose things.
Best of luck,
Jim Clark-Dawe